topic Re: reduce read/write time in SPI driver on MQX 4.0.2 in Vybrid Processors https://community.nxp.com/t5/Vybrid-Processors/reduce-read-write-time-in-SPI-driver-on-MQX-4-0-2/m-p/305570#M2774 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I forgot to mention that I'm using Vybrid (M4 side), and I like know...How to I reduce the read time in SPI driver for MQX 4.0.2...</P><P></P><P>Regards,</P><P>Francsico</P></BODY></HTML> Fri, 28 Mar 2014 00:00:28 GMT helderhdw 2014-03-28T00:00:28Z reduce read/write time in SPI driver on MQX 4.0.2 https://community.nxp.com/t5/Vybrid-Processors/reduce-read-write-time-in-SPI-driver-on-MQX-4-0-2/m-p/305569#M2773 <HTML><HEAD></HEAD><BODY><P>I need to reduce the time of date transfer by SPI drive. The time to write/read data is:</P><P>ioctl (spiFD, IO_IOCTL_SPI_READ_WRITE, &amp;rw) -&gt; 18 us</P><P>ioctl (spiFD, IO_IOCTL_SPI_FLUSH_DEASSERT_CS, NULL) -&gt; 8us</P><P>sum = 26 us</P><P></P><P>I need 4us in FULL_DUPLEX mode. is possible? help me..</P><P></P><P>Att,</P><P>Francisco</P></BODY></HTML> Thu, 27 Mar 2014 20:47:34 GMT https://community.nxp.com/t5/Vybrid-Processors/reduce-read-write-time-in-SPI-driver-on-MQX-4-0-2/m-p/305569#M2773 helderhdw 2014-03-27T20:47:34Z Re: reduce read/write time in SPI driver on MQX 4.0.2 https://community.nxp.com/t5/Vybrid-Processors/reduce-read-write-time-in-SPI-driver-on-MQX-4-0-2/m-p/305570#M2774 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I forgot to mention that I'm using Vybrid (M4 side), and I like know...How to I reduce the read time in SPI driver for MQX 4.0.2...</P><P></P><P>Regards,</P><P>Francsico</P></BODY></HTML> Fri, 28 Mar 2014 00:00:28 GMT https://community.nxp.com/t5/Vybrid-Processors/reduce-read-write-time-in-SPI-driver-on-MQX-4-0-2/m-p/305570#M2774 helderhdw 2014-03-28T00:00:28Z Re: reduce read/write time in SPI driver on MQX 4.0.2 https://community.nxp.com/t5/Vybrid-Processors/reduce-read-write-time-in-SPI-driver-on-MQX-4-0-2/m-p/305571#M2775 <HTML><HEAD></HEAD><BODY><P>Hi <SPAN style="color: #3d3d3d; font-family: 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;">Francsico</SPAN>,</P><P></P><P>You must provide more information, especially:</P><P>- your spi settings</P><P>- your rw data structure content</P><P></P><P>Do you need call IO_IOCTL_SPI_FLUSH_DEASSERT_CS after each read write operation?</P><P></P><P>Regards,</P><P>Jozef</P></BODY></HTML> Tue, 08 Apr 2014 13:57:35 GMT https://community.nxp.com/t5/Vybrid-Processors/reduce-read-write-time-in-SPI-driver-on-MQX-4-0-2/m-p/305571#M2775 cyborgnegotiato 2014-04-08T13:57:35Z